IEEE C37.63-2013 pdf free download – IEEE Standard Requirements for Overhead, Pad-Mounted, Dry-Vault, and Submersible Automatic Line Sectionalizers for Alternating Current Systems Up to 38 kV.
4.1.2 Outdoor switchgear
Subclause 2.1.2 of IEEE Std C37.100.1-2007 applies with the following addition.
i) Flooding
A Submersible Automatic Line Sectionalizer (subsurface or vault) that is installed in a below-grade enclosure may be subject to occasional flooding to a depth not exceeding 3 m above the top of the switchgear.
Exposure to chemical or electrochemical reactions may be encountered in a below-grade environment. The below-grade environment may contain chemicals that contribute to mild corrosive reactions.
j) Icing conditions
The ice coating shall be considered in the range from 1 mm up to, but not exceeding, 20 mm.
4.2 Special (unusual) service conditions
Subclause 2.2, and all of its subclauses, of IEEE Std C37.100.1-2007 apply.
5. Ratings
5.1 Rating information
The list of ratings given in the first paragraph of Clause 4 of IEEE Std C37.100-2007.1 does not apply and is replaced by the following list of ratings.
a) Rated maximum voltage
b) Rated lightning impulse withstand voltage
c) Rated power frequency
d) Rated continuous current
e) Rated short-time (symmetrical) withstand current and duration
f) Rated peak withstand current
g) Rated control voltages (where applicable)
The following switching ratings are optional; they only apply to sectionalizers that are designed for the respective switching ratings.
a) Rated load-switching current
b) Rated line charging and cable charging current
c) Rated unloaded transformer switching current
d) Rated fault-making current
e) Rated ice breaking capability
NOTE— Ice rating of 1 mm is assumed unless a higher rating is declared by the manufacturer. See 7.110.2.
5.2 Rated maximum voltage (V)
NOTE—In IEC standards, rated maximum voltage is denoted by U r .
Subclause 4.1, and its subclauses, of IEEE Std C37.100.1-2007 do not apply.
The rated maximum voltage indicates the upper limit of the highest voltage of systems for which the switchgear is intended. The preferred values of rated maximum voltage are given in Table 1 and Table 2. Special ratings for series coil sectionalizers are given in Annex B.IEEE C37.63 pdf download.